An adventure to the heart of the ocean would not gonna be easy, that's why you need to prepare for this huge adventure in order for you to accomplished it. After getting the Siren's Gills, your next mission is to find your 2nd Atlantean's armor. You need to find all the Atlantean's armor for you to survive in your adventure through the heart of the ocean.
This Map is created in Minecraft Bedrock 1.18
The mcworld file is already inside this zip file, all you need to do is to unzip it.